Abstract:The preparation of self-healing polyurethane materials from renewable resources can not only meet the needs of practical applications, but also matches the green sustainable development strategies.Bio-based furandiamine was synthesized from furfurylamine, and further reacted with vanillin through Mannich reaction to obtain Schiff base containing dynamic imine bonds. The synthesized Schiff base was empolyed as a chain extender and mixed with polyurethane prepolymers, a polyurethane with self-healing and recyclability was prepared. The mechanical properties and self-healing properties of polyurethane can be controlled by simply adjusting the ratio of soft and hard segments. The formation of Schiff bases was demonstrated by NMR and IR. Then, the self-healing and recyclable properties of elastomers was systematically investigated by Differential scanning calorimetry (DSC), polarized light resonance microscopy (POM), and tensile testing. When the molar ratio of hard segment, soft segment and chain extender is 3:1:2, and the elastomer was heated at 80°C for 2 hours, the self-healing efficiency can reach 97.5%. At the same time, the existence of dynamic imine bonds enables the material to be recycled again at room temperature. All the results show that the above-mentioned polyurethane elastomers have excellent self-healing efficiency and recyclable properties, providing potential applications as promising bio-based schiff bases in repairing the cracks quickly generated in composites that require recyclability as well as sustainability.